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"Effect of a CO2 laser on the inhibition of root surface caries adjacent to restorations of glass ionomer cement or composite resin - an in vitro study."


This study investigated the effect of CO2 laser irradiation on the inhibition of secondary caries on root surfaces adjacent to glass ionomer cement (GIC) or composite resin (CR) restorations. 40 dental blocks were divided into 4 groups: G1 (negative control) - cavity preparation + adhesive restoration with CR; G2 - (positive control) cavity preparation + GIC restoration; G3 - group 1 + CO2 laser with 6 J/cm2; and G4 - group 2 + CO2 laser. The blocks were submitted to thermal and pH cycling. Dental demineralization around restorations was quantified using microhardness analyses and Light-Induced Fluorescence (QLF). The groups showed no significant differences in mineral loss at depths between 20 ¼m and 40 ¼m. At 60 ¼m, G2 and G3 ` G1 but G4 = G1, G2, G3 and G4 ` G1 at 80 ¼m, and G4 = G2 = G1 at 100 ¼m. G2, G3 and G4 = G1 at 140 and 220 ¼m. The averages obtained using QFL in groups 1, 2, 3 and 4 were 0.637, 0.162, 0.095 and 0.048, respectively. QLF and microhardness analyses showed that CO2 laser irradiation reduced mineral loss around the CR restorations but that it did not increase the anti-cariogenic effect of GIC restorations. (AU)

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